CHOROID

Question 1

CHOROID

Answer 1

• lines sclera from the ora serrata to the edge of optic disc
• heavily pigmented with melanin containing cells giving it a brown colour for light absorption

Question 2

VASCULAR STRUCTURE OF CHOROID

Answer 2

provides route for metabolites to the anterior eye

nutrition to + removing waste from retinal receptors

Question 3

CHOROIDAL LAYERS

Answer 3

1. suprachoroid
2. stroma
3. choriocapillaris
4. basal lamina (bruch’s membrane)

Question 4

SUPRACHOROID LAYER

Answer 4

• transition zone between choroid + sclera
• collagen fibres continuous with those of sclera + melanocytes + fibroblasts
• carries nerves + BV’s to/ from anterior uvea

Question 5

CHOROIDAL STROMA

Answer 5

• pigment layer consisting of BV’s
• between vessels are melanocytes + fibroblasts with some collagen + ground substance
• macrophages + lymphocytes present

Question 6

CHORIOCAPILLARIS

Answer 6

• capillaries lie in a single plane against internal limiting lamina of choroid, not distributed throughout thickness of tissue
• capillaries unusually wide
• free of pigment

Question 7

CHOROIDAL BASAL LAMINA (BRUCH’S MEMBRANE)

Answer 7

layered with outer elastic + inner cuticular lamina

Question 8

CUTICULAR LAMINA

Answer 8

consists of basement membrane of RPE + a layer of collagen

Question 9

DRUSEN

Answer 9

ageing of Bruch’s membrane thickens to form these mounds which contain granular material secreted by RPE